Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-02-25
1995-02-14
Voeltz, Emanuel T.
Electrical generator or motor structure
Dynamoelectric
Rotary
310218, H02K 100, H02K 1716
Patent
active
053898478
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rotor for a high speed induction type ac motor. More particularly, it relates to rotor for a high speed induction type ac motor, provided with an iron core being a stacked assembly of laminations made of plates of magnetic material such as a silicon steel, with a plurality of axial through-bores formed in the periphery thereof. Electro-conductive rods made of aluminum rods are pressed in the plurality of bores of the iron core so as to be fixed therein, with ends protruding from opposite ends of the iron core. Electro-conductive end rings are arranged at the opposite ends of the iron core so as to be mechanically engaged with and electrically connected to the electro-conductive rods. Slitted tubular pins are forcibly fit in blind bores formed at the opposite ends of the electro-conductive rods so that elastic extension of the pins ensures rigid and fixed connection between the ends of the electro-conductive rods and the electro-conductive end rings.
PRIOR ART
A conventional high speed induction type ac motor, especially an induction type ac motor incorporated in a machine tool as a rotary drive source for providing the spindle of the machine tool with high speed rotation, typically has a rotative rotor having a construction such that the stacked iron core of the rotor is formed with a plurality of slots, and end portions filled with aluminum by a die-casting, or squeeze casting method. The cast aluminum functions as electrical conductors of the rotor when magnetic flux passes through the iron core.
when the aluminum is cast in the slots and the end portions of an iron core by the die-casting or squeeze casting method, the iron core is put in place in a metallic mould into which aluminum melt is poured under pressure. Thus, the aluminum cast rotor for an induction type ac motor can be produced at a considerably high production rate.
Nevertheless, in the rotor construction having therein cast aluminum electric conductors, the generation of cavities within the cast aluminum cannot be avoided. Therefore, when the rotor is rotated at a high speed, the cast aluminum of the rotor sometimes bursts at portions adjacent to the cavities, thereby causing electrical and/or mechanical damage to the induction type motor.
DESCRIPTION OF THE INVENTION
Accordingly, a principal object of the present invention is to improve the construction of the above-described conventional rotor for an induction type ac motor.
Another object of the present invention is to provide a rotor for a high speed induction type ac motor, provided with a construction such that the aluminum electric conductors permitting passage of an electric current in response to the passing of the magnetic flux through the iron core are mechanically assembled in the iron core so as to prevent the generation of casting cavities that might occur during the conventional die-casting or squeeze casting method.
A further object of the present invention is to provide a rotor for a high speed induction type ac motor, in which the rotor is mechanically assembled from separately prepared elements, i.e., an iron core, electro-conductive rods or bars made of aluminum bars and press-fit in a plurality of through-bores formed in the periphery of the iron core, annular-shape end rings attached to opposite ends of the iron core so as to be connected to the aluminum electro-conductive rods, and a slitted tubular pin for providing a rigid mechanical connection between the aluminum electro-conductive rods and the end rings in a manner such that the connections of the elements are not loosened even under high speed rotation of the rotor in order to prevent deterioration in the mechanical and electric performances of the motor.
To achieve the above-mentioned objects, in accordance with the present invention, there is provided a rotor for a high speed induction type ac motor having a construction which comprises: through-bores disposed at peripheral portions thereof so as to pierce therethrough and be equiangularly arranged in
REFERENCES:
patent: 1924103 (1933-08-01), Bisschop
patent: 4217690 (1980-08-01), Morreale
Patent Abstracts of Japan, vol. 7, No. 162, Jul. 15, 1983, JP-A-58 069 451, Apr. 25, 1983.
Hayashi Yoshiyuki
Nakamura Kosei
Numai Kazuhisa
Fanuc Ltd.
To E.
Voeltz Emanuel T.
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